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Determine how the flash erased. IOS missing

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  • Determine how the flash erased. IOS missing

    Dear All,

    Greetings!

    One of my client is using Cisco 3900 Series Router, configured and working fine.
    Suddenly their network goes down. I checked at Router, it is in ROMMON mode and the flash: is empty (no contents in flash).

    Now I want to know how it happened? Is there any way to determine the cause of files missing?

    Please help me in finding the answer.

    Thanks.

  • #2
    Re: Determine how the flash erased. IOS missing

    Bad flash chip(s), perhaps?

    I've experienced something similar twice. In one case, an older Cisco router suddenly started logging error messages related to the flash file system. The next reload caused the router to get stuck in ROMMON. The other case involved an ASA 5505 that suddenly refused to boot after having been powered off for a few hours. Upon further inspection, the flash file system was hosed.

    You may have to replace the flash memory module. Unless I'm very much mistaken, the 3900 series uses standard CompactFlash cards that can be had for a song just about anywhere.

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    • #3
      Re: Determine how the flash erased. IOS missing

      Dear Ser Olmy

      Thanks for your reply. My compact Flash is workin fine (I connected it to my PC using card reader im able copy, delete and edit files without formatting it in windows).

      This is My Router Startup and output of some commands.

      -------------------------------------------------------------------------------------------------------------
      System Bootstrap, Version 15.0(1r)M6, RELEASE SOFTWARE (fc1)
      Technical Support: http://www.cisco.com/techsupport
      Copyright (c) 2010 by cisco Systems, Inc.


      Total memory size = 1024 MB - DIMM0 = 512 MB, DIMM1 = 512 MB

      CISCO3945-CHASSIS with C3900-SPE150/K9 with 1048576 Kbytes of main memory

      Main memory is configured to 72/72(dimm 0/1) bit mode with ECC enabled


      Readonly ROMMON initialized

      Compact Flash0: Not present
      System Bootstrap, Version 15.0(1r)M6, RELEASE SOFTWARE (fc1)
      Technical Support: http://www.cisco.com/techsupport
      Copyright (c) 2010 by cisco Systems, Inc.


      Total memory size = 1024 MB - DIMM0 = 512 MB, DIMM1 = 512 MB

      CISCO3945-CHASSIS with C3900-SPE150/K9 with 1048576 Kbytes of main memory

      Main memory is configured to 72/72(dimm 0/1) bit mode with ECC enabled


      Readonly ROMMON initialized

      Compact Flash1: Not present
      System Bootstrap, Version 15.0(1r)M6, RELEASE SOFTWARE (fc1)
      Technical Support: http://www.cisco.com/techsupport
      Copyright (c) 2010 by cisco Systems, Inc.


      Total memory size = 1024 MB - DIMM0 = 512 MB, DIMM1 = 512 MB

      CISCO3945-CHASSIS with C3900-SPE150/K9 with 1048576 Kbytes of main memory

      Main memory is configured to 72/72(dimm 0/1) bit mode with ECC enabled


      Readonly ROMMON initialized

      Compact Flash0: Not present
      System Bootstrap, Version 15.0(1r)M6, RELEASE SOFTWARE (fc1)
      Technical Support: http://www.cisco.com/techsupport
      Copyright (c) 2010 by cisco Systems, Inc.


      Total memory size = 1024 MB - DIMM0 = 512 MB, DIMM1 = 512 MB

      CISCO3945-CHASSIS with C3900-SPE150/K9 with 1048576 Kbytes of main memory

      Main memory is configured to 72/72(dimm 0/1) bit mode with ECC enabled


      Readonly ROMMON initialized

      rommon 1 > dev

      Devices in device table:

      id name

      flash0: compact flash 0

      flash: compact flash 0

      flash1: compact flash 1

      bootflash: boot flash

      usbflash0: usbflash0

      usbflash1: usbflash1


      rommon 2 > dir flash:


      rommon 3 > dir bootflash:


      Invalid devbase

      device does not contain a valid FS

      dir: cannot open device "bootflash:"
      Last edited by kris_amar; 30th May 2014, 10:18.

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